Lux
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| !Illuminance!!Example | !Illuminance!!Example | ||
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| - | |10<sup>-5</sup> lux ||Light from the brightest star [[Sirius]] | + | |10<sup>-5</sup> lux ||Light from the brightest star '''[[Sirius]]''' |
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| - | |10<sup>-4</sup> lux||Total [[starlight]], overcast sky | + | |10<sup>-4</sup> lux||Total '''[[starlight]]''', overcast sky |
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| - | |0.002 lux||Moonless clear night sky with [[airglow]] | + | |0.002 [[lux]]||Moonless clear night sky with '''[[airglow]]''' |
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| - | |0.01 lux||Quarter moon | + | |0.01 [[lux]]||Quarter moon |
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| - | |0.27 lux||Full moon on a clear night | + | |0.27 [[lux]]||Full moon on a clear night |
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| |1 lux||Full moon overhead at tropical '''[[latitude]]'''s | |1 lux||Full moon overhead at tropical '''[[latitude]]'''s | ||
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| |50 lux||Family living room | |50 lux||Family living room | ||
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| - | |80 lux||Hallway/toilet | + | |80 [[lux]]||Hallway/'''[[toilet]]''' |
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| - | |100 lux ||Very dark overcast day | + | |100 [[lux]] ||Very dark overcast day |
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| - | |320 lux || Recommended office lighting | + | |320 [[lux]] || Recommended office lighting |
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| - | |400 lux ||'''[[Sunrise]]''' or '''[[sunset]]''' on a clear day. Well-lit office area. | + | |400 [[lux]] ||'''[[Sunrise]]''' or '''[[sunset]]''' on a clear day. Well-lit office area. |
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| - | |500 lux ||Lighting level for an office according to the European law UNI EN 12464. | + | |500 [[lux]] ||Lighting level for an office according to the European law UNI EN 12464. |
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| - | |1,000 lux||Overcast day | + | |1,000 [[lux]]||Overcast day |
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| - | |10,000–25,000 lux ||Full '''[[daylight]]''' (not direct sun) | + | |10,000–25,000 '''[[lux]]''' ||Full '''[[daylight]]''' (not direct sun) |
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| - | |32,000–130,000 lux||Direct '''[[sunlight]]''' | + | |32,000–130,000 '''[[lux]]'''||Direct '''[[sunlight]]''' |
| |} | |} | ||
Revision as of 13:03, 12 July 2010
A lux meter for measuring illuminances in work places. The lux (symbol: lx) is the SI unit of illuminance and luminous emittance. It is used in photometry as a measure of the apparent intensity of light hitting or passing through a surface. It is analogous to the radiometric unit watts per square metre, but with the power at each wavelength weighted according to the luminosity function, a standardized model of human brightness perception.
| Illuminance | Example |
|---|---|
| 10-5 lux | Light from the brightest star Sirius |
| 10-4 lux | Total starlight, overcast sky |
| 0.002 lux | Moonless clear night sky with airglow |
| 0.01 lux | Quarter moon |
| 0.27 lux | Full moon on a clear night |
| 1 lux | Full moon overhead at tropical latitudes |
| 3.4 lux | Dark limit of civil twilight under a clear sky |
| 50 lux | Family living room |
| 80 lux | Hallway/toilet |
| 100 lux | Very dark overcast day |
| 320 lux | Recommended office lighting |
| 400 lux | Sunrise or sunset on a clear day. Well-lit office area. |
| 500 lux | Lighting level for an office according to the European law UNI EN 12464. |
| 1,000 lux | Overcast day |
| 10,000–25,000 lux | Full daylight (not direct sun) |
| 32,000–130,000 lux | Direct sunlight |
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Reference
- 1 Wikipedia Reference see Lux [1]
